678 SCIENTIFIC RECORD FOR 1883. 



McCay, LEROY W. Beitrag zur Kenntniss der Kobalt-, Nickel-, mid 

 Eisenkiese. Inaugural-Dissertation. Freiberg. 



Mallard, E. Sur le polychroisme des cristaux. Bull. Soe. Min. 

 France, VI, 45. Sur la chaleur latente correspondant au change- 

 meut d'6"tat cristallin de la boracite. lb., p. 122. Sur la determin- 

 ation des indices principaux de la boracite. lb., p. 129. 



MtJGGE, O. Beitriige zur Kenntniss der Structurflachen des Kalk- 

 spatbes, etc. Jabrb. Min., 1883, I, 32. Ueber Gleitfliichen an 

 Gyps, Antimonglanz, etc. Jabrb. Min., 1883, it, 13. 



Rontgen, W. C. Ueber die durcb electriscbe Krafte erzeugte Aende- 

 ruug der Doppelbrecbuug des Quarzes. Oberbess. Ges. Nat.- and 

 Heilkunde, xxn, 49, 97. Ueber de tbermo-, aktino-, und piezo-elec- 

 triscben Eigenscbaften des Quarzes. lb., xxii, 181. 



Schmidt, A. Ueber das Fuess'scbe Fiiblhebelgoniometer. Zeitsck. 

 Kryst., viii, 1. 



Schuster, Max. Studien iiber die Flachenbeschaffenheit und die 

 Bauweise der Danburitkrystalle vom Scopi in Graubiindten. 

 Tscbermak., Min. Petr. Mittb., V, 397. 



Sjogren, Hj. Om de norska apatit forekouisterna ocb om sannolikke- 

 ten att antraffa apatit i Sverige. Geol. For. Forh. Stockbolm, vi, 

 447. 



Soret, Ch. Ueber ein Refractometer zur Messung der Brecbungsex- 

 ponenten und der Dispersion fester Korper. Zeitscb. Kryst., vn, 

 529. 



Thoulet, J. Mesure par la reflexion totale des indices refraction des 

 min^raux niicroscopiques. Bull. Soc. Min. France, VI, 184. 



Tschermak, G. Die Skapolithreibe. Sitz.-Ber. Akad. Wiss. Wien. 

 Nov., 1883. 



NECROLOGY OF MINERALOGISTS, 1883. 



J. Reinhard Blum.— Born October 28, 1802; died August 21, 1883. 

 For many years professor of mineralogy at Heidelberg ; bis principal 

 work was bis treatise on pseudomorpbs, publisbed in 1843, witb four sup- 

 plements publisbed in 1847, 1852, 1863, 1879; be was also tbe author of 

 a general work on mineralogy and anotber on litbology. 



Franz von Kobell.— Born July 19, 1803; died November 11, 1882. 

 Professor of mineralogy at Munich, author of a general work on min- 

 eralogy, a volume of tables for the determination of minerals (in 11 edi- 

 tions), of a work on the history of mineralogy, and of many separate 

 memoirs. 



J. Lawrence Smith, of Louisville, Ky. Born December 16, 1818; 

 died October 12, 1883. He was the author of many memoirs devoted to 

 the chemical composition of American minerals, and also to the descrip- 





